The fault, responsible for eight deaths, was thought to apply to 13 models and affect 21,000 cookers, of which 6,000 have yet to be traced.

Now Beko has said 837 converted Beko, Leisure or Flavel models made before 2009, may pose a serious safety risk.

A company spokesman said that 480 of these are as yet untraced.

Affected LPG models must include

All Beko, Leisure and Flavel models manufactured before 2009

Cookers adapted to LPG using a genuine Beko LPG conversion kit

Models with a separate grill and oven which have not had a door seal modification

He told BBC News the LPG conversion kits were supplied in the UK for cookers with a separate grill and oven.

"We want to find them urgently so we can implement the simple modification, free of charge, and eliminate the safety risk," he said.

"When we identified the issue with the LPG conversions on these specific models, we immediately instructed our call centres to tell anyone who requested a kit from Beko that they had to make the door seal modification as part of the installation.

"We also started to include instructions in the LPG conversion kits we supplied that the modification to the door seal must be made when the kit is installed."